Thermal Energy Question Preview (ID: 47955)
Transfer Of Thermal Energy.
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A beaker of water is being heated by a single heat source at the bottom. What keeps the water at the top of the beaker the same temperature as that of the bottom?
a) F Heat from the burner radiates through the liquid and causes even heating.
b) G Evaporation heats the water at the top and the flame heats the water at the bottom.
c) H The walls of the beaker reflect heat toward the center, so the water heats evenly.
d) Heated water molecules and steam rise in the beaker, carrying heat by convection.
10 mL of water is at 40 degrees C is mixed with 10 mL of water at 20 degrees C. What is most likely to be the temperature of the mixture?
a) 70°C
b) 25°C
c) 50°C
d) 35°C
9 On a sunny day, exposed rock on the top of a mountain gradually heats up. What causes the rock to become warm?
a) Warm winds caused by convection warm the rock through conduction.
b) Light waves are transformed into heat energy in the rock.
c) The hot air above the rock warms the rock through convection.
d) Thermal energy from the ground warms the rock through conduction.
7 The glass of a window pane feels cooler to the touch than the wood frame surrounding the glass. This is because
a) wood is a better thermal insulator than glass.
b) glass is always at a lower temperature than wood.
c) wood is a better thermal conductor than glass.
d) wood contains more thermal energy than glass.
Popcorn was placed in an air popper above the heat source. What form of thermal energy transfer is this and why?
a) Radiation because the microwave uses electrical energy.
b) Convection B because the microwave uses a form of light energy to cook the popcorn.
c) Convection because the popcorn was above the heat source and cooked by hot air rising.
d) Conduction because the pan is in contact with the popcorn.
Popcorn was placed in a bag and cooked in a microwave oven. What form of thermal energy transfer is this and why?
a) Radiation because the microwave uses a form of light energy to cook the popcorn.
b) Conduction because the popcorn was cooked by being in contact with the heat source.
c) Convection because the popcorn was above the heat source and cooked by hot air rising.
d) Radiation because the pan is in contact with the popcorn.
Popcorn was placed in a covered pan and the pan was warmed on a hot plate. What form of thermal energy transfer is this and why?
a) Conduction because the hot plate heats the air which heats the popcorn
b) Conduction because the pan is in contact with the popcorn.
c) Convection because the popcorn was above the heat source and cooked by hot air rising.
d) Radiation B because the microwave uses a form of light energy to cook the popcorn.
3 Which of the following sentences best describes the process that occurs when liquid water becomes ice?
a) Energy is removed from the water, so its molecules lock in place.
b) Energy is removed from the water, so its molecules move apart.
c) Energy is added to the water, so its molecules move apart.
d) Energy is added to the water, so its molecules move more quickly.
1 Railroad tracks have gaps between the rails so that they will not buckle in hot weather because of
a) specific heat.
b) thermal conductivity.
c) thermal insulation.
d) thermal expansion.
2 How does thermal energy flow when a student holds a piece of ice in her hand?
a) Thermal energy does not flow between her hand and the ice cube.
b) Thermal energy flows from her hand to the ice cube.
c) Thermal energy flows back and forth between her hand and the ice cube
d) Thermal energy flows from the ice cube to her hand.
A student is mixing a cup of hot chocolate with a spoon. How is the heat transferred between the hot chocolate and the part of the spoon that is in the hot chocolate?
a) Conduction transfers energy from the spoon to the hot chocolate.
b) Conduction transfers energy from the hot chocolate to the spoon.
c) Convection transfers energy from the spoon to the hot chocolate.
d) Convection transfers energy from the hot chocolate to the spoon.
What causes your skin to feel warm when it is in the sun on a summer day?
a) Particles in the atmosphere reflect energy from the Sun downward.
b) Hot particles from the Sun still carry some heat when they reach your skin.
c) The solar wind carries heated air from the Sun’s atmosphere to Earth’s surface.
d) The Sun radiates energy that passes through space and the atmosphere to your skin.
Place the objects below in order from greatest thermal energy to least thermal energy. A glacier at -5°C, A cup of coffee at 70°C, A can of soda at 5°C, A swimming pool at 28°C
a) cup of coffee, swimming pool, can of soda, glacier
b) glacier, swimming pool, can of soda, cup of coffee
c) glacier, can of soda, swimming pool, cup of coffee
d) glacier, swimming pool, cup of coffee, can of soda
Which of the following spoon handles would get hot the quickest in a pan of hot soup?
a) a metal spoon
b) a plastic spoon
c) a rubber spoon
d) a wooden spoon
A darkcolored wall becomes warm when the sun shines on it. After sunset, a person standing a meter away can feel warmth from the wall. How does heat transfer from the wall to the person?
a) radiation
b) conduction
c) convection
d) insulation
A small container of water at 30° C was placed in a large container of water at 70° C. The temperature of each container was measured. After 30 minutes, what most likely occured?
a) Water in the first container is 70° C and the water in the second container was 30° C.
b) Water in the first container is 60° C and the water in the second container was 60° C.
c) Water in the first container is 40° C and the water in the second container was 100° C.
d) Water in the first container is 20° C and the water in the second container was 20° C.
A student put a metal pot on the stove to boil some water. The metal transferred heat to the water through
a) radiation.
b) insulation.
c) convection.
d) conduction.
How would you label a convection current?
a) Oil os less dense and floats on water. Water is more dense and sinks in oil.
b) Liquid water evaporates. Condensed water precipitates.
c) Animals take in oxygen for respiration. Plants take in carbon dioxide for photosynthesis.
d) Warm air molecules move faster and rise. Cool air molecules move slower and sink.
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